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Nightingale is a completely free, open source audio player and web browser based on the Songbird media player source code. As such, Nightingale's engine is based on the Mozilla XULRunner with libraries such as the GStreamer media framework and libtag providing media tagging and playback support, amongst others. Since official support for Linux was dropped by Songbird in April, 2010, Linux-using members of the Songbird community diverged and created the project. Contrary to Songbird, which is primarily licensed under the GPLv2 but includes artwork that is not freely distributable, Nightingale is entirely free software, licensed under the GPLv2, with portions under the MPL and BSD licenses.

Notable features

Plugins compatible with Songbird
Multi-platform compatibility with Windows XP, Vista, 7 and Mac OS X v10.5 (x86, x86-64).
Ability to play multiple audio formats, such as MP3, AAC, Ogg Vorbis, FLAC, Apple Lossless and WMA
Ability to play Apple FairPlay-encoded audio on Windows and Mac platforms via hooks into QuickTime (authorization takes place in iTunes)
Ability to play Windows Media DRM audio on Windows platforms
Media files stored on pages viewed in the browser show up as playable files in Nightingale
MP3 file download
Ability to subscribe to MP3 blogs as playlists
Ability to build custom mixes
Ability to scan the user's computer for all audio files and add them to a local library
A configurable and collapsible graphical user interface similar to iTunes, and mini-player mode
Keyboard shortcuts and media keyboard support
Last.fm integration via a plugin, complete with love/hate buttons
Insound.com and HypeMachine integration
Microsoft MTP compatible device support
Ability to edit and save metadata tags
Gapless playback & ReplayGain
Watch folders
Media importing / exportings (from and to iTunes)
Automatic Library Files Organization

Users can add features and change functionality in Nightingale by installing extensions. Extensions are similar to the Extensions for the Firefox browser and can be easily ported. Community coded extensions are available on The Nightingale Addons Page.

Skins

Skins are referred to as "feathers" in Nightingale, and give users and artists the ability to change the look of Nightingale via an extension which generates a default skin. Using CSS (and optionally XUL), and an image manipulation program such as Photoshop or GIMP, users are then able to make Nightingale look however they want.